Bump actions/checkout from 2 to 4 (#158)

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/prod.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
@@ -43,7 +43,7 @@ jobs:
     needs: build
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Deploy
         uses: sledilnik/action-helm-deploy@master

.github/workflows/stage.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
@@ -44,7 +44,7 @@ jobs:
     if: "!contains(github.event.head_commit.message, 'NODEPLOY')"
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Deploy
         uses: sledilnik/action-helm-deploy@master